Chapter-11 Sound — Online MCQ Test
SCIENCE · Samacheer Kalvi 9th · Tamil Nadu State Board
Practice Chapter-11 Sound with a free chapter-wise online MCQ test.
This chapter covers: Description Explains the nature of sound vibration frequency pitch and applications Keywords Sound Vibration Frequency Pitch Waves.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-11 Sound — Important Questions & Answers
What is sound?
- A. A form of energy produced by vibrating bodies
- B. A form of matter produced by heat
- C. A magnetic effect produced by light
- D. A chemical change in air
Answer: A. A form of energy produced by vibrating bodies
Sound is produced when an object vibrates and creates energy that travels through a medium. It is not matter or a chemical change.
Sound is produced when an object vibrates and creates energy that travels through a medium. It is not matter or a chemical change.
Which of the following is the unit of frequency?
- A. Joule
- B. Hertz
- C. Newton
- D. Metre
Answer: B. Hertz
Frequency is measured in hertz (Hz). One hertz means one vibration per second.
Frequency is measured in hertz (Hz). One hertz means one vibration per second.
A tuning fork produces sound when it is struck because it:
- A. Becomes heated
- B. Starts vibrating
- C. Changes into a magnet
- D. Reflects light
Answer: B. Starts vibrating
Sound is produced by vibrating bodies. When a tuning fork vibrates, it sets the surrounding air into vibration.
Sound is produced by vibrating bodies. When a tuning fork vibrates, it sets the surrounding air into vibration.
A man hears a sound of 200 Hz and another of 2000 Hz. Which statement is correct?
- A. 200 Hz sound has higher pitch
- B. 2000 Hz sound has higher pitch
- C. Both have same pitch
- D. Pitch does not depend on frequency
Answer: B. 2000 Hz sound has higher pitch
Higher frequency means higher pitch. Therefore, 2000 Hz sound will have a higher pitch than 200 Hz sound.
Higher frequency means higher pitch. Therefore, 2000 Hz sound will have a higher pitch than 200 Hz sound.
Which of the following pairs is correctly matched?
- A. High frequency — low pitch
- B. Low frequency — high pitch
- C. High amplitude — loud sound
- D. Low amplitude — louder sound
Answer: C. High amplitude — loud sound
Loudness increases with amplitude, so high amplitude means a louder sound. The other options give incorrect relations between sound properties.
Loudness increases with amplitude, so high amplitude means a louder sound. The other options give incorrect relations between sound properties.